CF CNC Retractable Landing Gear Skid for DJI Flamewheel F450 F550 FPV MultirotorF450 / F550 Retractable Landing Gear. Simply connect the two servo cable on the retractable landing gear with the included Y splitter servo cable, then connect the Y splitter cable into a channel of your receiver. Then you can use a switch on your transmitter to retract or lower your landing gear. Simple and works beautifully. No more legs in the video. Package contents shown in the first picture Specs: Height: 10 inch Width: 12.5 inch Weight: 6.6oz (188gram) Refer to the picture for dimensions. Installation Instruction: This landing gear is very simply to install and setup. Simply follow the steps below: 1. Connect the two servos on the landing gear to the included Y cable, then connect the Y cable to one of your receiver's empty channel. 2. Find a 2 position switch on your transmitter, assign that switch to the receiver channel where you connected the Y cable. 3. The landing gear could be retracted by flipping the switch. 4. For mounting this to the F550, match the two holes on the mounting plate on the servo to the two holes on on the F550 where you mount the arms, use the included screws to mount each leg.